Hot blast valve seat

ABSTRACT

A frusto-conical, water-cooled valve seat is welded to the bottom flange of a spool piece, adapted to be inserted into a pipe line, and it is shaped to coact with the lower surface of a mushroom valve.

United States Patent [1 1 Powell Oct. 30, 1973 HOT BLAST VALVE SEAT [75] lnventor: Russell A. Powell, Pittsburgh, Pa.

[73] Assignee: Koppers Company Inc., Pittsburgh,

[22] Filed: Jan. 19, 1972 21 App]. No.: 219,082

[52] US. Cl. 137/340 [51] Fl6k 49/00 [58] Field 01 Search... 137/340 [56] References Cited UNITED STATES PATENTS 3,259,143 7/1966 Powell et a1. 137/340 860,865 7/1907 Hartman 997,461 7/1911 McCarthy... 1,951,677 3/1934 Rosener 137/340 6/1938 Currie 137/340 X 2,575,875 11/1951 Johnson 137/340 3,266,517 8/1966 Carr 137/240 3,439,910 4/1969 Regelin et a1 137/340 X 3,616,812 11/1971 Vietorisz 137/340 FOREIGN PATENTS OR APPLICATIONS 4/1963 France 137/340 Primary Examiner-Samuel Scott Attorney-Sherman l-l. Barber et a1,

[57] ABSTRACT A frusto-conical, water-cooled valve seat is welded to the bottom flange of a spool piece, adapted to be inserted into a pipe line, and it is shaped to coact with the lower surface of a mushroom valve.

7 Claims, 3 Drawing Figures HOT BLAST VALVE SEAT BRIEF SUMMARY OF THE INVENTION The present invention relates to valves for controlling the flow of high temperature gases, such as the hot air blast from a blast furnace stove and the like, and, more particularly, to an improved valve seat for such valves.

The valve seat of the present invention includes a frusto-conical, internally cooled structure which is se cured to a heavy flange of a spool piece that is adapted to be inserted into a pipe carrying such hot gases; The valve seat is almost entirely surrounded by refractory insulation material, and a compressible refractory material is disposed between the refractory material and the valve-seat structure.

For a further understanding of the invention and for features 'and advantages thereof, reference may be made to the following description and the drawing which illustrates a preferred embodiment of equipment in accordance with the invention.

BRIEF DESCRIPTION OF THE DRAWING In the drawing:

FIG. 1 is a schematic cross sectional viewof a valve seat in accordance with the invention;

FIG. 2 isan enlarged view of a portion of the valve seat of FIG. 1; and

FIG. 3 is a schematic diagram of the flow path of cooling fluid in the valve seat of FIG. 1.

DETAILED DESCRIPTION FIG. 1 illustrates a form of hot blast valve seat 11 in accordance with the invention, which valve'seat 11 is shown as installed in a conduit 13 like that carrying hot blast air from a conventional blast furnace stove (not shown). A conventional hot blast, mushroom-type valve 15, like that described in US. Pat. No. 3,259,143, is disposed in the conduit 13 and it is adapted to coact with the valve seat 11 to control the flow of hot gases in the conduit 13.

The valve seat 11 is installed preferably in a spool piece 17 which is provided with a conventional top flange 19 and a bottom flange 19a, that are bolted to flanges 21 'on the conduit 13. I

As shown in FIG. 2, the valve seat 11 comprises a lower, frusto-conical annular plate 23, and a spacedapart upper frusto-conical annular plate 25; the annular plates 23, 25 being connected peripherally by a onepiece seat portion 27. Disposed'between the lower 23 and the upper 25 annular plates are baffles or vane dividers 29, 31, and an end closure plate 33. From FIG. 3 it will be noticed that other baffle plates 35,37 are in which cooling fluid flows. The baffle plates 35, 37

' are so located that cooling fluid, entering the space 39 through a conduit 41, flows in the direction of the arrow A in the labyrinth passages withinv the valve seat 11, and thence from the space 39 through a conduit 43.

The periphery of the seat portion 27, as shown in FIG. 2, is chamfered as at 45 to provide. formetal to metal contact with the bottom surface of the mushroom valve 15.

The annular lower plate 23, being slightly wider than the upper plate 25, is secured as by welding to the bot tom annular flange 19. A plurality of tee-shaped'an- 'chors 47 are threaded into nuts 49 that are welded to the lower plate 23, about as shown in FIG. 2. The teeshaped anchors 47 are embedded in and support a suitable refractory 51, preferably of the castable type, that is shaped to provide a passageway 53 through the spool piece 17. A high-temperature, compressible, insulating refractory blanket 55 such as that sold under the trade mark FIBERFRAX, is disposed between the lower plate 23 and the castable refractory 51. The compressible insulating refractory blanket material 55 is used to absorb any deflection of the valve seat 11 when the mushroom valve 15 is closed, and also to prevent fracturing of the refractory substance 51 if any 'shock forces are present when the valve 15 closes.

The top plate 25 is insulated initially from other castable refractory 57 by a thin layer of cardboard 59, or the like, which quickly burns away in service, leaving a space between the upper plate 25 and the refractory 57. The valveseat 11, when heated in service, can then expand into such space after the cardboard 59 burns away. The refractory 57 is held in position by means of other tee-shaped anchors 61 which are threaded into nuts'63 welded to the inner wall 65 of the spool piece It will be recognized by those skilled in the art that the novel valve seat 11 of the present invention is a frusto-conical, water-cooled structure incorporated in a refractory lined spool piece mounted in a conduit leading from a hot blast main to a stove connection, as

a typical installation.

The .frusto-conical seat of the invention is welded preferably to the spool piece flange; whereby, it seals positively against any air pressure acting on the upper surface of *the mushroom valve. Such air pressure could, and oftentimes does, leak past the flange seat and the flange connection of prior art valves of the type disclosed herein, which is an undesirable circumstance;

The valve seat of the'invention is significantly better able to transmit forces exerted by the mushroom valve when seated, due to high pressure air acting on the upper surface of the mushroom valve. Such forces in the valve seat of the invention are carried into the heavy flange of the spool piece and'are, thereby, adequately distributed. In like manner, severe shock forces may be equally distributed in case of accidental rapid closing of the valve; and Y The layer of insulating, compressible, refractory blanket beneath the valve seat absorbs sudden shock loads acting on the valve seat so that the refractory surrounding the valveseat is not damaged.

Although the invention has been described herein with a certain degree of particularity it is understood that the present disclosure has been made only as an example and that the scope of the invention is defined by what is hereinafter claimed.

What is claimed is:"

L'In' a valve assembly for regulating fluid flow, including a valve seat and a valve disc coacting therewith, the improved valve seat comprising:

a. a frusto-conical structure having a seating surface that cooperates with said valve disc and internal cooling fluid passages therethrough;

b. means fixing said frusto-conical structure to a member adapted to be inserted into a pipe line carrying a fluid;

c. anchor means secured to said member; and

(1. first refractory material surrounding said anchoring means and partially surrounding said frustoconical structure.

2. The structure of claim 1 including:

a. a second compressible refractory material disposed between one surface of said structure and said first refractory material.

3. The structure of claim 2 including:

a. a third refractory material disposed proximately to, but spaced apart from, another surface of said structure; and

b. anchor means securing said third refractory material to said member.

4. In a valve assembly for regulating fluid flow in a pipe line including a valve seat and a valve disc, the improvement comprising:

a. a frusto-conical structure having an internalfluid flow passage therein which is subdivided by internal vanes into a plurality of fluid flow passages;

b. a spool piece having at least one flange that coacts with another flange of said pipe line;

c. means securing the larger open end of said frustoconical structure to said flange of said spool piece;

d. means for conducting cooling fluid into said fluid flow passages and thence out of said frusto-conical structure;

e. first refractory material disposed proximately to, but in spaced apart relation to, one surface of said frusto-conical structure;

f. second refractory material disposed between said first refractory material and said proximate frustoconical surface; and

g. third refractory material disposed proximately to but in spaced apart relation to an opposite surface of said frusto-conical structure.

5. The structure of claim 4 including:

a. anchor means securing said first refractory material in place; and

b. anchor means securing said third refractory material in place.

6. The structure of claim 4 wherein:

a. said second refractory material is compressible.

7. The structure of claim 4 wherein:

a. said frusto-conical structure has a seat portion which engages and forms a metal to metal seal with said valve disc. 

1. In a valve assembly for regulating fluid flow, including a valve seat and a valve disc coacting therewith, the improved valve seat comprising: a. a frusto-conical structure having a seating surface that cooperates with said valve disc and internal cooling fluid passages therethrough; b. means fixing said frusto-conical structure to a member adapted to be inserted into a pipe line carrying a fluid; c. anchor means secured to said member; and d. first refractory material surrounding said anchoring means and partially surrounding said frusto-conical structure.
 2. The structure of claim 1 including: a. a second compressible refractory material disposed between one surface of said structuRe and said first refractory material.
 3. The structure of claim 2 including: a. a third refractory material disposed proximately to, but spaced apart from, another surface of said structure; and b. anchor means securing said third refractory material to said member.
 4. In a valve assembly for regulating fluid flow in a pipe line including a valve seat and a valve disc, the improvement comprising: a. a frusto-conical structure having an internal fluid flow passage therein which is subdivided by internal vanes into a plurality of fluid flow passages; b. a spool piece having at least one flange that coacts with another flange of said pipe line; c. means securing the larger open end of said frusto-conical structure to said flange of said spool piece; d. means for conducting cooling fluid into said fluid flow passages and thence out of said frusto-conical structure; e. first refractory material disposed proximately to, but in spaced apart relation to, one surface of said frusto-conical structure; f. second refractory material disposed between said first refractory material and said proximate frusto-conical surface; and g. third refractory material disposed proximately to but in spaced apart relation to an opposite surface of said frusto-conical structure.
 5. The structure of claim 4 including: a. anchor means securing said first refractory material in place; and b. anchor means securing said third refractory material in place.
 6. The structure of claim 4 wherein: a. said second refractory material is compressible.
 7. The structure of claim 4 wherein: a. said frusto-conical structure has a seat portion which engages and forms a metal to metal seal with said valve disc. 